The Philadelphia Union has reached an agreement on transfer terms with Manchester City to send 14-year-old academy player Cavan Sullivan to Manchester when he turns 18, say sources briefed on the deal, who added that the agreement is heavy on add-ons and includes a sell-on percentage. In the meantime, Sullivan is finalizing an MLS homegrown contract with the Union that will keep him stateside until his move across the Atlantic. Sources say the homegrown deal is the richest in MLS history. Sullivan will be eligible to debut for the Union first team once it is signed. The Union agreed with City....